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A 41.5 kg parachutist lands moving straight downward with a speed of 3.90 m/s. (a) If the parachutist comes to rest with constant acceleration over a distance of 0.710 m, what force does the ground
Sound does not travel through the vacuum of space. Explain why this is true. Go beyond just medium - explain it in terms of vibrations and particles.
A 9300 kg boxcar traveling at 15.0 m/s strikes a second boxcar at rest. The two stick together and move off with a speed of 6.0 m/s. What is the mass of the second car?
at what point, as measured from the center of the earth, does the gravitational force exerted on the craft by the earth balance the gravitational force exerted by the moon? this point lies on a lie
A 55 kg pole vaulter running at 10.0 m/s vaults over the bar. If the vaulter's horizontal component of velocity over the bar is 1.1 m/s and air resistance is disregarded, how high was the jump?
Now the same puck is transported far into outer space, where both friction and gravity are negligible. The same constant force is applied to the puck and the puck's acceleration is measure. What is
Four particles with masses m1 = 10 kg, m2 = 30 kg, m3 = 6 kg, and m4 = 40 kg sit on a very light (massless) metal sheet and are arranged as shown below. Find the moment of inertia of this system wit
A building made with a steel structure is 303 m high on a winter day when the temperature is 0_F. How much taller is the building when the temperature is 103_F? The linear expansion coefficient of s
A sealed cubical container 17.0 cm on a side contains three times Avogadro's number of molecules at a temperature of 16.0°C. Find the force exerted by the gas on one of the walls of the contain
The speed of an ultrasonic sound of frequency 45 Hz in air is 352 m/s. What is the air's temperature?
A soccer ball is kicked at an angle of 30 degrees at 10 m/s from ground level. What are the horizontal and vertical components of its initial velocity?
When she leaves the track, she follows the characteristic path of projectile motion. Ignoring friction and air resistance, find the maximum height H to which she rises above the end of the track.
Show that the time rate of change of mechanical energy for a damped, undriven oscillator is given by dE/dt = -bv^2 and hence is always negative. To do so, differentiate the expression for the mecha
When you pull horizontally on a crate with a force of 330 N, it slides across the floor in dynamic equilibrium. How much friction acts on the crate?
An 800 N gorilla swings from vine to vine. As the gorilla grabs a new vine, both vines form an angle of 30o with the vertical. What is the net force on each vine?
A toy car runs off the edge of a table that is h = 1.150 m high. The car lands d = 0.425 m from the base of the table. How fast was the car going on the table?
When a 124 N bag of nails hangs motionless from a single vertical strand of rope, how much tension is exerted in the strand?
Mary weighs 475 N and she walks down a flight of stairs to a level 5.00 m below her starting point. What is the change in Mary's potential energy
An 9.0 m, 200 N uniform ladder rests against a smooth wall. The coefficient of static friction between the ladder and the ground is 0.55, and the ladder makes a 50.0° angle with the ground. How
A loudspeaker of mass 17.0 {rm kg} is suspended a distance of h = 2.20 {rm m} below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 3.70 {rm m}.
A man is running at speed c (much less than the speed of light) to catch a bus already at a stop. At t=0, when he is a distance b from the door to the bus, the bus starts moving with the positive a
what is the correct angle of banking of the road? (b) If the curve were not banked, what would be the minimum coefficient of friction between tires and road that would keep traffic from skidding out
Racing drivers like tow arm up the tyres of their car as soon as possible. One reason is that warm tyres grip the road better but the temprature also affects the pressure of the air int he tyres. E
A 5000 kg helicopter accelerates upward at 0.50 m/s2 while lifting a 2000 kg car. What is the lift force exerted by the air on the rotors? What is the tension in the cable that connects the car to t
A 73.0 kg base runner begins his slide into second base when moving at a speed of 4 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just